ZUNl AND COLORADO RIVERS. 173 



Q. agrifolia, Nees ; Hook. Icon. 3, t. 377 ; Hook, and Arn. Bot. Beech., p. 

 391. ■ Yampai Creek ; October, (ripe fruit.) A dwarf, much branched species^ 

 seldom attaining a greater height than eight feet. Our specimens agree exactly 

 with the figure of Hooker, above quoted. 



Q. oblong-ifolia : foliis coriaceis (perennantibus) oblongis utrinque obtusis into- 

 gcrrirnis glabris apice muticis ; fructibus sessilibus solitariis ; cupula hemisphe- 

 rica turbinata, squamis ovatis convexis ; glandc ovata cupulam triplo superanto 

 obtusa cum umbone parvo conico. 



Western New Mexico. This very neat species of live-oak I am obliged to 

 describe as a new species, as I cannot find that it has been hitherto noticed. 



(•RTICACEiE. 



Hamulus Lupulus, Linn.; Gray, Bot. of N. St., p. 435. II. Jmcricanus, 

 Nutt. in Jour. Acad. Phil. (n. ser.) 1, p. 181. On the Rio San Francisco of 

 Western New Mexico. I cannot find sufficient characters for distinguishing the 

 N. American from the European hop. 



CONIFERS. 



Pinus edulis, Engelm. in Wisliz. Mem. N. Mex., p. 88. Head of the Rio La- 

 guna, New Mexico, and Carissa creek, California ; September, December, (with 

 mature cones.) The seeds of this species are edible, and much esteemed by the 

 Indians. It is related to the singular P. monophylla, Torr., described in Fre- 

 mont's 1st report. 



P. macrophylla, Engelm. I.e.? On the Zuiii mountains; August. Differs 

 from the description of Dr. Engelmann in the leaves being constantly in threes, 

 and shorter (about 7| inches long,) and in the smaller cones. 



Pinus (Mies) Douglassi, Sabine Mss. in Hook, Fl. Bor. Am., 2, p. 162, t. 183? 

 San Francisco mountains, 7,000 feet above the sea. Our specimens are without 

 fruit, and we therefore cannot be certain of the species, but the foliage agrees 

 exactly with Douglas's plant. 



Juniper us. —Three species of this genus occurs in the collection 1. A large 

 tree, with a trunk sometimes two feet in diameter, and bark more than four 

 inches thick. The leaves of the ultimate branches arc very minute, rhombic 

 ovate and acute, convex, closely imbricated , with a conspicuous resiniferous gland 

 on the back. The fruit is spherical, as large as a rifle-l.n 11, covered witli a blue 

 bloom, minutely and sparingly tubereulate, and usually contains three seeds. It 

 grows in the western part of New Mexico. 2. A tree attaining the height of 

 Thirty feet, with a smooth bark ; differing from the preceding in its stouter 

 branchlets, broadly ovate, more obtuse, and much more convex leaves. The fruit 

 (also covered with a bloom) is a little smaller, inclining to ovate, less tuberculous. 



